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server.c
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <stdarg.h>
#include <unistd.h>
#include <ctype.h>
#include <sys/types.h>
#include <sys/socket.h>
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#ifdef TIME_WITH_SYS_TIME
#include <time.h>
#endif
#else
#include <time.h>
#endif
#include <sys/wait.h>
#include <sys/select.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <fcntl.h>
#include <errno.h>
#include <netdb.h>
#include <pwd.h>
#ifdef HAVE_SSL
#include <openssl/crypto.h>
#include <openssl/x509.h>
#include <openssl/pem.h>
#include <openssl/ssl.h>
#include <openssl/err.h>
#include <openssl/rand.h>
#endif
#include "sbuf.h"
#include "struct.h"
#include "send.h"
#include "ctcp.h"
#define S_READ 1
#define S_WRITE 2
#define S_EXCEPT 4
struct selectfds
{
int fd_setsize;
size_t size;
int nfds;
fd_set *rfds;
fd_set *wfds;
fd_set *efds;
};
extern int h_errno;
extern char logbuf[];
extern int bnclog (confetti * jr, char *logbuff);
extern void add_access (confetti *, accesslist *);
extern int handlepclient (struct cliententry *cptr, int fromwho, int pargc, char **pargv, char *prefix);
extern void bnckill (int reason);
extern int wipechans(struct cliententry *cptr);
extern int remnl (char *buf, int size);
extern void *pmalloc(size_t size);
extern char *helplist[];
extern char *helplista[];
extern unsigned char motdb[];
int a_sock = 0;
int s_sock = 0;
struct sockaddr_in muhsin;
struct sockaddr wipi;
int sinlen;
unsigned char allbuf[PACKETBUFF+1];
unsigned char buffer[PACKETBUFF+1];
#ifdef HAVE_SSL
SSL_CTX *SSL_CTX_client;
SSL_CTX *SSL_CTX_server;
#endif
int setnonblock(int fd)
{
int flags;
#ifdef O_NONBLOCK
flags = fcntl(fd, F_GETFL, 0);
if(flags == -1)
flags = 0;
return fcntl(fd, F_SETFL, flags | O_NONBLOCK);
#else
flags = 1;
return ioctl(fd, FIONBIO, &flags);
#endif
}
struct cliententry *headclient;
confetti *jack;
struct pdcc *headpdcc;
struct ldcc *headldcc;
int logprint(confetti *jr, const char *format, ...)
{
time_t clk;
struct tm *tp;
const char dayweek[7][4] = { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" };
const char month[12][4] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
va_list ap;
va_start(ap, format);
if(jr->logfile == NULL)
return 0;
time(&clk);
tp = localtime(&clk);
if(tp != NULL)
fprintf(jr->logfile, "%.3s %.3s%3d %02d:%02d:%02d %d ", dayweek[tp->tm_wday], month[tp->tm_mon], tp->tm_mday, tp->tm_hour, tp->tm_min, tp->tm_sec, tp->tm_year + 1900);
vfprintf(jr->logfile, format, ap);
fflush(jr->logfile);
va_end(ap);
return 0;
}
int thestat(char *buf,int len, struct cliententry *cptr)
{
int p,d;
char *st[2] =
{
"spunbackd",
"SPUNBACKD",
};
d=cptr->flags;
for(p=0;st[0][p];p++)
{
if(p+1 >= len)
{
break;
}
else
{
buf[p]=st[ d&1 ][p];
}
d=d>>1;
}
buf[p]='\0';
return p;
}
int chanlist(char *buf,int len, struct cliententry *client)
{
int p,c,f;
char *s;
struct chanentry *cptr;
p=0;
cptr=client->headchan;
c=0;
memset(buf,0,len);
while(cptr)
{
c++;
if(p>0)
{
buf[p++]=' ';
}
for(s=cptr->chan;*s;s++)
{
buf[p++]=*s;
if(p>=len)
{
break;
}
}
if(p<len)
{
buf[p]='\0';
cptr=cptr->next;
}
else
{
c=-1;
p--;
buf[p--]='\0';
for(f=3;f>0;f--)
{
buf[p]='.';
}
cptr=NULL;
}
}
return c;
}
/*
* experimental matching code (WD) I hope this runs faster, who knows...
*/
int check_match (char *mask)
{
if (!index (mask, '*') && !index (mask, '?'))
return 0;
else if (!strcmp (mask, "*"))
return 1;
else
return 2;
}
/*
* Note, thanx to RogerY and Redtrio for this wonderful code. Please
* keep this notice intact. -- TazQ
*/
/*
* My wildcard matching functions. I think it works well :) Seems to be
*/
/*
* working stablely, but not too sure.
*/
int
match (char *str, char *wld)
{
int i = check_match (wld);
switch (i)
{
case 0:
return strcasecmp (str, wld);
break;
case 1:
return 0;
break;
}
if (!(*wld) || !(*str))
return 1;
while (*wld || *str)
{
if (tolower (*wld) == tolower (*str))
{
wld++;
str++;
}
else if (tolower (*wld) != tolower (*str) && *wld == '*')
{
int i = 0;
char *st;
st = (char *) pmalloc( sizeof(char) * strlen(wld) + 1);
while (*wld == '*' && *wld)
{
wld++;
if (!*wld)
return 0;
}
while (*wld && *wld != '*' && *wld != '?')
{
st[i] = *wld;
i++;
wld++;
}
st[i] = '\0';
while (*str && strncasecmp (st, str, strlen (st)))
str++;
if (!strncasecmp (st, str, strlen (st)))
str += strlen (st);
else
return 1;
}
else if (tolower (*wld) != tolower (*str) && *wld == '?' && *wld && *str)
{
wld++;
str++;
}
else if (tolower (*wld) != tolower (*str))
return 1;
}
return 0;
}
int passwordokay (char *s, char *pass)
{
char *encr;
char *crypt ();
if(*pass == '+')
{
pass++;
encr = crypt(s, pass);
}
else
encr = s;
if(strcmp(encr, pass) == 0)
return 1;
return 0;
}
int connokay (struct sockaddr_in *sa, confetti * jr)
{
struct hostent *hp;
accesslist *na;
hp = gethostbyaddr ((char *) &sa->sin_addr, sizeof (struct in_addr), AF_INET);
logprint(jack, "Connection from %s\n", inet_ntoa (sa->sin_addr));
if (!jr->has_alist)
{
return 1;
}
for (na = jr->alist; na; na = na->next)
{
if (na->type == 1)
{
if (!match (inet_ntoa (sa->sin_addr), na->addr))
return 1;
}
else if (na->type == 2 && hp)
{
if (!match (hp->h_name, na->addr))
return 1;
}
}
return 0;
}
int lsock_read(struct lsock *ls, void *buf, size_t len)
{
#ifdef HAVE_SSL
if(ls->ssl)
{
int res;
res = SSL_read(ls->ssl, buf, len);
if(res < 0)
{
int SSLerror;
SSLerror = SSL_get_error(ls->ssl, res);
if(SSLerror == SSL_ERROR_WANT_READ || SSLerror == SSL_ERROR_WANT_WRITE)
{
errno = EAGAIN;
ls->repmode = REPEAT_READ;
return -1;
}
errno = 0;
return -1;
}
return res;
}
#endif
return recv(ls->fd, buf, len, 0);
}
int lsock_write(struct lsock *ls, void *buf, size_t len)
{
#ifdef HAVE_SSL
if(ls->ssl)
{
int res;
res = SSL_write(ls->ssl, buf, len);
if(res < 0)
{
int SSLerror;
SSLerror = SSL_get_error(ls->ssl, res);
if(SSLerror == SSL_ERROR_WANT_READ || SSLerror == SSL_ERROR_WANT_WRITE)
{
errno = EAGAIN;
ls->repmode = REPEAT_WRITE;
return -1;
}
errno = 0;
return -1;
}
return res;
}
#endif
return send(ls->fd, buf, len, 0);
}
int send_queued(struct lsock *ls)
{
int res;
int length;
char *msg;
while(sbuf_getlength(&ls->sendq) > 0)
{
msg = sbuf_pagemap(&ls->sendq, &length);
if(msg == NULL)
break; /*XXX*/
if(length <= 0)
break; /*XXX*/
// res = send(ls->fd, msg, length, 0);
res = lsock_write(ls, msg, length);
if(res == -1)
{
if(errno == EINTR)
continue;
if(errno == EAGAIN)
break;
return -1;
}
sbuf_delete(&ls->sendq, res);
}
return 0;
}
int wipeclient(struct cliententry *cptr)
{
wipechans(cptr);
if(cptr->loc.fd > -1)
{
send_queued(&cptr->loc);
close(cptr->loc.fd);
cptr->loc.fd=-1;
}
if(cptr->srv.fd > -1)
{
send_queued(&cptr->srv);
close(cptr->srv.fd);
cptr->srv.fd=-1;
}
#ifdef HAVE_SSL
if(cptr->loc.ssl)
{
SSL_free(cptr->loc.ssl);
cptr->loc.ssl = NULL;
}
if(cptr->srv.ssl)
{
SSL_free(cptr->srv.ssl);
cptr->srv.ssl = NULL;
}
#endif
sbuf_clear(&cptr->loc.sendq);
sbuf_clear(&cptr->loc.recvq);
sbuf_clear(&cptr->srv.sendq);
sbuf_clear(&cptr->srv.recvq);
return 0;
}
int freeclientlist (struct cliententry *cptr)
{
struct cliententry *hptr;
while (cptr != NULL)
{
hptr = cptr->next;
wipeclient(cptr);
cptr = hptr;
}
return 1;
}
int bewmstick (void)
{
freeclientlist(headclient);
headclient = NULL;
bnckill(FATALITY);
return 0;
}
struct cliententry *getclient (struct cliententry *cptr, int nfd)
{
while (cptr != NULL)
{
if (cptr->loc.fd == nfd)
{
return cptr;
}
if (cptr->srv.fd == nfd)
{
return cptr;
}
cptr = cptr->next;
}
return NULL;
}
int countfds (struct cliententry *cptr)
{
int p;
p = 0;
for(p=0;cptr;cptr=cptr->next)
{
if(cptr->loc.fd == -1)
{
continue;
}
p++;
}
return p;
}
char *gethost (struct in_addr *addr)
{
struct hostent *hp;
hp = gethostbyaddr ((char *) addr, sizeof (struct in_addr), AF_INET);
if(hp)
{
return hp->h_name;
}
return inet_ntoa (*addr);
}
int identwd_lock(struct sockaddr_in *sin, int port)
{
FILE *fp = NULL;
struct passwd *pw;
char filename[1024];
pw = getpwuid (getuid ());
if(pw == NULL)
{
return -1;
}
sprintf (filename, "%s/.identwd/%s.%i.LOCK",
pw->pw_dir, inet_ntoa (sin->sin_addr), port);
fp = fopen (filename, "w");
if (fp)
{
fprintf (fp, "WAIT\n");
fclose(fp);
return 0;
}
return -1;
}
int identwd_unlock(int s, struct sockaddr_in *sin, int port, char *uname)
{
FILE *fp = NULL;
struct passwd *pw;
char filename[1024];
pw = getpwuid(getuid());
if(pw == NULL)
{
return -1;
}
sprintf (filename, "%s/.identwd/%s.%i.LOCK",
pw->pw_dir, inet_ntoa (sin->sin_addr), port);
fp = fopen (filename, "w");
if (fp)
{
int len = sizeof (struct sockaddr_in);
struct sockaddr_in mysa;
getsockname (s, (struct sockaddr *) &mysa, &len);
fprintf (fp, (char *) "%s %i %s\n",
(char *) inet_ntoa (mysa.sin_addr),
(u_short) ntohs (mysa.sin_port), uname);
fclose(fp);
return 0;
}
return -1;
}
int irc_connect(struct cliententry *cptr, char *server, u_short port, char *pass, int ctype, int cflags)
{
int fd;
int res;
struct hostent *he;
int rfamily;
int lfamily;
int dolocal;
struct sockaddr_in lsin4;
struct sockaddr_in rsin4;
struct sockaddr_in6 lsin6;
struct sockaddr_in6 rsin6;
cptr->flags &= ~FLAGAUTOCONN;
cptr->susepass=0;
if(cptr->flags & FLAGCONNECTED)
{
tprintf(&cptr->loc, "NOTICE AUTH :Disconnecting old\n", server, port);
if(cptr->srv.fd > -1)
{
close(cptr->srv.fd);
cptr->srv.fd=-1;
}
cptr->flags &= ~FLAGCONNECTED;
}
sbuf_clear(&cptr->srv.sendq);
sbuf_clear(&cptr->srv.recvq);
tprintf(&cptr->loc, "NOTICE AUTH :Making reality through %s port %i\n", server, port);
memset(&lsin4, 0, sizeof(lsin4));
memset(&rsin4, 0, sizeof(rsin4));
memset(&lsin6, 0, sizeof(lsin6));
memset(&rsin6, 0, sizeof(rsin6));
lfamily = rfamily = AF_INET;
do
{
res = inet_pton(AF_INET, server, &rsin4.sin_addr);
if(res)
{
rfamily = AF_INET;
break;
}
res = inet_pton(AF_INET6, server, &rsin6.sin6_addr);
if(res)
{
rfamily = AF_INET6;
break;
}
#ifdef HAVE_GETHOSTBYNAME2
if(ctype == 1)
{
he = gethostbyname2(server, AF_INET6);
if(he)
{
rfamily = AF_INET6;
memcpy(&rsin6.sin6_addr, he->h_addr, he->h_length);
break;
}
}
#endif
he = gethostbyname(server);
if(he)
{
rfamily = AF_INET;
memcpy(&rsin4.sin_addr, he->h_addr, he->h_length);
break;
}
#ifdef HAVE_GETHOSTBYNAME2
if(ctype != 1)
{
he = gethostbyname2(server, AF_INET6);
if(he)
{
rfamily = AF_INET6;
memcpy(&rsin6.sin6_addr, he->h_addr, he->h_length);
break;
}
}
#endif
return -1;
} while(0);
do
{
char *server;
server = cptr->vhost;
if(server == NULL)
{
dolocal = 0;
break;
}
dolocal = 1;
res = inet_pton(AF_INET, server, &lsin4.sin_addr);
if(res)
{
lfamily = AF_INET;
break;
}
res = inet_pton(AF_INET6, server, &lsin6.sin6_addr);
if(res)
{
lfamily = AF_INET6;
break;
}
#ifdef HAVE_GETHOSTBYNAME2
if(ctype == 1)
{
he = gethostbyname2(server, AF_INET6);
if(he)
{
lfamily = AF_INET6;
memcpy(&lsin6.sin6_addr, he->h_addr, he->h_length);
break;
}
}
#endif
he = gethostbyname(server);
if(he)
{
lfamily = AF_INET;
memcpy(&lsin4.sin_addr, he->h_addr, he->h_length);
break;
}
#ifdef HAVE_GETHOSTBYNAME2
if(ctype != 1)
{
he = gethostbyname2(server, AF_INET6);
if(he)
{
lfamily = AF_INET6;
memcpy(&lsin6.sin6_addr, he->h_addr, he->h_length);
break;
}
}
#endif
lfamily = AF_INET;
dolocal = 0;
} while(0);
if(dolocal && lfamily != rfamily)
dolocal = 0;
if(rfamily == AF_INET)
{
rsin4.sin_family = AF_INET;
rsin4.sin_port = htons (port);
}
else /* if(rfamily == AF_INET6) */
{
rsin6.sin6_family = AF_INET6;
rsin6.sin6_port = htons(port);
}
lsin4.sin_family = AF_INET;
fd = socket (rfamily, SOCK_STREAM, 0);
if(fd == -1)
{
tprintf(&cptr->loc, "NOTICE AUTH :Failed Connection\n");
return -1;
}
res = setnonblock(fd);
if(res == -1)
{
tprintf(&cptr->loc, "NOTICE AUTH :Failed Connection\n");
close(fd);
return -1;
}
if(dolocal)
{
if(lfamily == AF_INET)
bind (fd, (struct sockaddr *) &lsin4, sizeof(lsin4));
else /* if(lfamily == AF_INET6) */
bind(fd, (struct sockaddr *) &lsin6, sizeof(lsin6));
}
if(rfamily == AF_INET && jack->identwd)
identwd_lock(&rsin4, port);
if(rfamily == AF_INET)
res = connect(fd, (struct sockaddr *)&rsin4, sizeof(rsin4));
else /* if(rfamily == AF_INET6) */
res = connect(fd, (struct sockaddr *)&rsin6, sizeof(rsin6));
if( res == -1)
{
switch(errno)
{
case EINPROGRESS:
cptr->flags |= FLAGCONNECTING;
break;
default:
tprintf(&cptr->loc, "NOTICE AUTH :Failed Connection\n");
close(fd);
return -1;
}
}
else
{
tprintf(&cptr->loc, "NOTICE AUTH :Suceeded connection\n");
logprint(jack, "(%i) %s!%s@%s connected to %s\n", cptr->loc.fd, cptr->nick, cptr->uname, cptr->fromip, server);
}
if(rfamily == AF_INET && jack->identwd)
identwd_unlock(fd, &rsin4, port, cptr->uname);
strncpy (cptr->onserver, server, HOSTLEN);
cptr->onserver[HOSTLEN]='\0';
strncpy (cptr->sid, server, HOSTLEN);
cptr->sid[HOSTLEN]='\0';
#ifdef HAVE_SSL
cptr->srv.ssl = NULL;
if(cflags & USE_SSL)
{
cptr->srv.ssl = SSL_new(SSL_CTX_client);
if(cptr->srv.ssl == NULL)
{
close(fd);
return -1;
}
SSL_set_fd(cptr->srv.ssl, fd);
res = SSL_connect(cptr->srv.ssl);
if(res < 0)
{
int SSLerror;
SSLerror = SSL_get_error(cptr->srv.ssl, res);
if(!(SSLerror == SSL_ERROR_WANT_READ || SSLerror == SSL_ERROR_WANT_WRITE))
{
SSL_free(cptr->srv.ssl);
close(fd);
return -1;
}
}
}
#endif
cptr->srv.fd = fd;
cptr->flags |= FLAGCONNECTED;
if(pass)
tprintf(&cptr->srv, "PASS :%s\n", pass);
tprintf(&cptr->srv, "NICK %s\n", cptr->nick);
tprintf(&cptr->srv, "USER %s \"%s\" \"%s\" :%s\n", cptr->uname, cptr->fromip, cptr->onserver, cptr->realname);
return 0;
}
/* trust the caller of handleclient to filter \0 \n and \r
* expects buflen be the len of the string, not counting the \0
* also expects a \0 to be appended.
*/
int handleclient (struct cliententry *cptr, int fromwho, int buflen, char *buf)
{
int f;
char *prefix;
char *pargv[9+1];
static char ibuf[512+1];
char *src;
char *eos;
int clen;
int pargc;
int iswhite;
f=0;
if(buflen <= 0)
return 0;
clen = buflen;
if(clen > 512)
clen= 512;
memcpy(ibuf, buf, clen);
src = ibuf;
eos = src + clen;
*eos = '\0';
for(;*src == ' '; src++); /* skip leading whitespace */
prefix=NULL;
pargc=0;
iswhite=0;
if(*src == ':')
{
prefix=++src;
pargc=0;
}
else
pargv[pargc++] = src;
for(;src < eos; src++)
{
if(iswhite) /* inside the whitespace */
{
if( *src == ':' )
{
pargv[pargc]=src + 1;
pargc++;
break; /* hit a string, meaning done */
}
if(*src != ' ')
{
iswhite=0; /* no longer white */
pargv[pargc++]=src;
if(pargc > 9)
break;
}
}
else
{
if(*src == ' ')
{
*src='\0';
iswhite=1;
}
}
}
f = handlepclient(cptr, fromwho, pargc, pargv, prefix);
if((cptr->flags & FLAGCONNECTED) && (f == FORWARDCMD))
{
f = 0;
if(fromwho == CLIENT)
{
tprintf(&cptr->srv, "%s\n", buf);
}
else
{
/* don't forward anything if its docked */
if( !(cptr->flags & FLAGDOCKED))
{
tprintf(&cptr->loc, "%s\n", buf);
}
}
}
return f;
}
void growfds(struct selectfds *fds, int hint)
{
int x;
struct selectfds nset;
if(hint < fds->fd_setsize)
return;
x = (hint + (FD_SETSIZE - 1)) / FD_SETSIZE;
nset.fd_setsize = FD_SETSIZE * x;
nset.size = sizeof(*nset.rfds) * x;
nset.rfds = realloc(fds->rfds, nset.size);
nset.wfds = realloc(fds->wfds, nset.size);
nset.efds = realloc(fds->efds, nset.size);
if((nset.rfds == NULL)
|| (nset.wfds == NULL)
|| (nset.efds == NULL))
bnckill(FATALITY); // not enough memory for basic functions
memset( ((char *)nset.rfds) + fds->size, 0, nset.size - fds->size);
memset( ((char *)nset.wfds) + fds->size, 0, nset.size - fds->size);
memset( ((char *)nset.efds) + fds->size, 0, nset.size - fds->size);
fds->size = nset.size;
fds->fd_setsize = nset.fd_setsize;
fds->rfds = nset.rfds;
fds->wfds = nset.wfds;
fds->efds = nset.efds;
}
void selectfd(struct selectfds *fds, int fd, int flags)
{
if(fd < 0)
bnckill(FATALITY);
if(fd >= fds->fd_setsize)
growfds(fds, fd); // no return on fail
if(flags & S_READ)
FD_SET(fd, fds->rfds);
if(flags & S_WRITE)
FD_SET(fd, fds->wfds);
if(flags & S_EXCEPT)
FD_SET(fd, fds->efds);
if(fd >= fds->nfds)
fds->nfds = fd + 1;
}
void initldcc(struct selectfds *fds)
{
struct ldcc *dccptr;
for(dccptr = headldcc; dccptr; dccptr=dccptr->next)
{
selectfd(fds, dccptr->fd, S_READ);
}
}